Metamorphic Mineral

Blue Quartz (Dumortierite Quartz)

Quartz (SiO2) with inclusions of Dumortierite (Al7(BO3)(SiO4)3O3)

Clear Quartz

Silicon Dioxide (SiO2)

Black Sapphire

Corundum (Al2O3 with inclusions of hematite or ilmenite)

Rhodonite in Quartz Matrix

Rhodonite (Manganese Silicate - (Mn,Fe,Mg,Ca)SiO3)

Clear Quartz

Silicon Dioxide (SiO2) / Rock Crystal

Quartz Pebble (often referred to as 'Sea Glass' or 'River Stone' when worn smooth)

Silicon Dioxide (SiO2)

Sugilite

KNa2(Fe,Mn,Al)2Li3Si12O30 (Potassium Sodium Lithium Iron Manganese Aluminum Silicate)

Milky Quartz

Quartz (Silicon Dioxide, SiO2)

Quartz with Hematite Inclusions

Silicon Dioxide (SiO2) with Ferric Oxide (Fe2O3)

Milky Quartz

Silicon Dioxide (SiO2)

Quartz (Iron-stained or Ferruginous)

Silicon Dioxide (SiO2)

Milky Quartz

Silicon Dioxide (SiO2)

Clear Quartz

Quartz (Silicon Dioxide, SiO2)

Rough Ruby

Corundum (Al2O3 with Chromium impurities)

Quartz (Iron-stained)

Silicon Dioxide (SiO2)

Sand Grain (Silica/Quartz Grain)

Silicon Dioxide (SiO2)

Iolite (Cordierite)

Magnesium Iron Aluminum Silicate (Mg,Fe)2Al4Si5O18

Red Garnet

Almandine (Fe3Al2(SiO4)3) or Pyrope (Mg3Al2(SiO4)3)

Unakite

Unakite (Metasomatized Granite)

Metagabbro / Epidote Gneiss

Epidote bearing Hornblende Gneiss

Schist

Mica Schist

Clear Quartz (Rock Crystal)

Silicon Dioxide (SiO2)

Citrine Quartz

Silicon Dioxide (SiO2) with iron impurities

Serpentine Schist with Quartz Vein

Serpentine Schist (a type of Metamorphic rock). The white band is likely Quartz (SiO2).

Nuummite

Nuummite (mixture of Anthophyllite and Gedrite)

Tiger's Eye

Pseudomorph of Quartz after Crocidolite (SiO2 with Iron inclusions)

Ruby in Kyanite

Corundum (Al2O3) in Kyanite (Al2SiO5)

Nuummite

Antophyllite-Gedrite (Orthorhombic amphiboles)

Tiger's Eye

Pseudomorph of Quartz after Crocidolite (SiO2 with iron inclusions)

Green Aventurine

Silicon Dioxide (SiO2) with inclusions of Fuchsite (K(Al,Cr)2(AlSi3O10)(OH)2)

Schist

Mica Schist

Schist

Mica Schist

Banded Gneiss

Gneiss (High-grade Regional Metamorphic Rock)

Gneiss

Gneiss

Quartzite

Quartzite (primarily SiO2)

Quartzite River Rock

Quartzite (primarily SiO2)

Schist

Mica Schist (primarily composed of quartz, feldspar, and mica)

Tiger's Eye

Pseudomorph of Quartz after Crocidolite (SiO2 with iron oxide inclusions)

Tiger's Eye

Pseudomorph of Quartz after Crocidolite (SiO2 with iron oxide inclusions)

Amazonite

K(AlSi3O8) - Lead-bearing Microcline (Tectosilicate)

Green Aventurine

Silicon Dioxide (SiO2) with inclusions of Fuchsite (K(Al,Cr)3Si3O10(OH)2)

Nephrite Jade

Ca2(Mg,Fe)5Si8O22(OH)2